
import 'dart:io';

void main(){
  stdout.write("请输入姓名：");
  var name = stdin.readLineSync();
  print("welcome:$name");

  Human man = Human();

  int? a;
  num b = 12.3;
  bool isLogin = false;
  BigInt longInt = BigInt.parse("121313123131412341231314342342");
  print(a);
  print(longInt);

  var nameList = [1,2,3,4,5];
  // nameList.replaceRange(0, 2, [8,6,7]);

  nameList.add(8);
  nameList.remove(11);
  print(nameList);

  var nameSet = {"a","b","c"};

  var nameMap = {"name":"zhangsan","age":18};
}

class Human{
  String name = "zhangsan";
  String age = "18";





}